Assert a BSTR with string - c++

Question

I have a test function as follow:
[TestMethod]
void RipMichaelJacksonTest()
{
string expected = "Hello";
BSTR actual = SysAllocString(L"Hello");
Assert::AreEqual(expected, actual);
}
The assert part will of course fail.
Is there any Assert function that i can use?
Im new to VC++.

Answer 1

The problem is that you are doing a AreEqual. Passing in two parameters will force AreEqual(Object^, Object^) which:
Verifies that two specified objects are equal. The assertion fails if the objects are not equal.
What you are actually looking for is the comparison of a wchar* and a char*. There is not a direct comparison function between the two so it will be necessary to convert from a string to a wstring. There are lots of examples of how to do that, such as: https://stackoverflow.com/a/7159944/2642059 and you'll need to do something similar, for example:
wstring get_wstring(const string& s) {
wstring buf;
const char* cs = s.c_str();
const size_t wn = mbsrtowcs(nullptr, &cs, 0, nullptr);
if (wn == string::npos) {
cout << "Error in mbsrtowcs(): " << errno << endl;
} else {
buf.resize(wn + 1);
if(mbsrtowcs(&*buf.begin(), &cs, wn + 1, nullptr) == string::npos) {
cout << "Error in mbsrtowcs(): " << errno << endl;
buf.resize(0);
}
}
return buf;
}
The return of get_wstring(expected) and actual will now both be wchars and can thereby be compared in the using AreEqual(String^, String^, bool)